Why in the world is everyone and their grandmothers so obsessed with making PSAs? That and insisting that THEIR way of doing things is not only the best but should be the ONLY way it should be done.
Secondly, you are comparing apples to oranges. Handhelds to home console (which has some portability but is still a home console at the end of the day). They both serve different niches. If I were to issue a PSA for people to get a PS Vita/ PS TV (as opposed to a Switch) instead of a N3DS if they already have the O3DS, it would be more valid that this. :\ Hell, I may as well ask people to not buy a tablet/phablet instead of a phone. Or a laptop over a tablet. You see where I am going with this?
Thirdly, a console's power is NOT everything. There are so many other factors to look into. Remember that time when the Vita (then dubbed NGP) was first teased? Some people were already writing the 3DS off because of specs. Look where we are now. On the same note, you can apply the same argument for the Vita vs PSP.
Fourthly, hacking on the Switch has just barely started. Who knows how long it will take. Oh and as mentioned in my second point, it serves a different demographic so it is more likely than not that it will take a loooooooong time before the Switch can do what someone would want to achieve from the 3DS.
Fifthly, the 3DS is dead? Source?
Sixthly, "Seriously switch will be way better when its hacked". Source? Lemme guess. Is it your crystal ball?